Heater



A.. A. CARDWELL.

HEATER.

APPLICATION FILED FEB. 11, 1919.

1,340,153. tented May 18, 1920.

. JNVENTOR T mbkskm A TTORNEY UNITED STATES PATENT OFFICE.

' ADDISON A. CARDWELL, OF NEW YORK, N. Y., ASSIGNOR TO I RA'IT &

CAIDY COMPANY,

INCORPORATED, OF'HAR-TFOED, CONNECTICUT, A CORPORATION.

HEATER.

Specification of Letters Patent.

Patented May 18, 1920.

Application filed February 11, 1919. Serial No. 276,429.

To all whom it may concern:

Be it known that I, ADDISON A. GARDWELL,

a citizen of the United States, residing in the city of New York, State of New York, have invented certain. new and useful Improvements in Heaters, of which the following is a specification.

My invention relates to the type of horizontal heater in which steam as a heating medium is passed through tubes which in turn are immersed in or surrounded by the substance to be heated. The object oi my invention is to devise a heater of this type in which a plurality of such tubes may be employed and which will permit of expansion and contraction of said tubes independently of each other without undue strain or stress on the tubes themselves or other portions of the structure, and which will at the same time permit of drainage or expulsion from the said tubes of water of condensation therein as the same may be formed.

Figure 1 of the drawings accompanying this application is a side elevation of the heater. Fig. 2 is a broken side elevation of the heater partly in section. Fig. 3 is a sectional view of one of the tubes and its connection with the tube sheet. Fig. 4 is a sectional view of one of the tubes on the line a a of Fig. 3.

Referring to the drawings in detail, the shell 1 of the heater, the heads 13 and 13 of which comprise the tube sheets of the heater, is provided with a steam chamber 2 at one end thereof and a condensing chamber 3 at the opposite end thereof. The shell 1 is also provided with inlets 4L and P and an outlet 5 and also with two apertures 6, the latter being for the removal of the contents of said shell whenever such removal may be necessary. The steam chamber 2 is provided with a steam inlet 7 and the condensation chamber 3 is provided with an outlet 8 through which water of condensation may pass. The steam tubes 9 lead from the steam chamber 2 through the chamber 9 formed by the shell 1 to the condensation chamber 3 and may be as numerous as the space within the shell will permit. The main sections of steam tubes 9 are of normal interior and exterior diameter at their inlets 10 and continue so throughout nearly their entire length. The opposite ends of the steam tubes 9, that is, the outlet ends or discharge ends are much reduced in diameter relative to the diameter of the main portion of said tubes, as shown in Fig. 3. This result may be accomplished by the union as shown at 12, of the section 11 much reduced in diameter but with a plug of proper diameter to form the union as shown in Fig. 3. As shown in Fig. 3, the bore 17 of the reduced portion 11 emerges from the enlarged portion of the steam tube at a level substantially that of the bottom of the bore of the enlarged portion and preferably continues therefrom at the same level. The reduced section 11 of the the steam tube passes through the tube sheet 13 and a stuffing box let employing screw cap 15 and ordinary packing material 16 is provided for securing a fluid and steam tight but slidable connection.

The walls of the reduced section 11 of the steam tube are made, regardless of the thickness of the walls of the remaining section, sufliciently thick to withstand the pressure of the packing, while the friction between the reduced section 11 and the packing is relatively small compared to the friction which would be produced were the full size of the steam tube passed through the tube sheet 13 to form the slidable connection. At the same time the bore of the reduced section 11 being located at or substantially at the bottom or" the steam tube 9, the removal of such water of condensation as forms in the steam tubes is readily effected by gravity or steam pressure or both.

Having thus described my invention, 1 claim:

1. A steam tube connection comprising a substantially horizontal steam tube having an end of reduced diameter relative to the diameter of the main section of said steam tube, the bore of said reduced portion leading from the bore of said main section at a level substantially that of the bottom of said bore, and a tube sheet provided with a stuiiing box through which said reduced end passes, thereby forming a steam and fluid tight slidable connection between said steam tube and said tube sheet.

2. In a heater, a shell, a plurality of steam tubes passing through the inclosure of said shell, the discharge ends of said steam tubes being of reduced diameter relative to the diameter of the main portion of said tubes, said discharge ends passing through stuffing boxes in said shell, the bore in said discharge ends leaving the bore of the main portion of said tubes at a level substantially that of the bottom of the latter.

3. In a heater, in combination, a shell, a steam chamber and a condensing chamber located oppositely to each other, and a plurality of steam tubes each of which passes from the steam chamber through the inclosure of the shell and through a stufling box in the shell to the condensing chamber, the ends of said steam tubes which pass through said stuffing box and emerge into the condensing chamber being of reduced cross-sectional area, said reduced ends having Walls of sufiicient thickness to Withstand the pressure of the packing and the bore in said reduced ends leading out from said enlarged portion of said steam tubes to form a drain tube for said enlarged portion.

4. In a heater, a shell, a plurality of steam tubes Within said shell and leading from a common source of steam supply through the inclosure of said shell, and through said shell to the exterior thereof, said reduced portion having Walls of sufficient thickness to Withstand the pressure of the packing regardless of the thickness of the remainder of the tube, and the bore in said reduced portion leading out from the enlarged portion of said tube at a level substantially that of the bottom of said enlarged portion.

In testimony whereof, I'have signed this specification.

ADDISON A. CARDVVELL. 

